Micah Hawks, of the very excellent Gralien Report blog, has an item on Alien Abduction and Mystic Experience, with a link to Brad Steiger's piece on his My Strangest Alien Abduction Case" on UFO Digest.
There are so many aspects to the UFO phenomenon; nuts and bolts, the usual. And the mystical. What to make of those kinds of experiences in connection to UFOs? Some have not seen UFOs in the typical sense, yet have experienced deep mystical/spiritual events that include non-human entities that the individual puts into the UFO category. Like Nahu, for example, author of UFOs: Gods From Inner Space,who I wrote about some time ago in UFO Magazine. He, and his partner, have gone on to experience events like this, including seeing beams of energy, having psychic characteristics, etc.
Are some types of extraterrestrials capable of inducing these encounters? Is it something within us that enters into a symbiotic relationship with some of "them?" Are they more earth bound, or inter-dimensional, and not strictly UFO connected?
As always, there isn't any one answer to what UFOs are; except to state the obvious, which is that there are many varities of types and experiences. One type does not negate or invalidate the other.